The corrosion resistance of copper is great! But if the hardness was better and the strength it would be way better than titanium in some cases (not the melting point)!!!
when air and water react with copper, it will cause corrosion.add. the common verdigris on copper is usually the carbonate, but close to the ocean, the chloride may be present as well.
Copper is very corrosion resistant - it does produce a very attractive green patina e.g on the roofs of mosques. To eliminate it entirely - constantly paint it - or use Impressed Current Cathodic...